I have mine mounted by the rear view mirror with the power cable running inside the headlining across to the drivers side A pillar.
From there it runs down and along the door frame rubber until it gets to the drivers footwell upper kick panel where it then goes behind and runs along the drivers side of the centre console until it pops out in the centre armrest cubby box.
I have an auxiliary power socket already for it inside. Nice and neat and the power cable is more than long enough for the entire run.
